Edwin will probably stick with you a while yet, but eventually he will leave. On my first time through all my evil characters decided to walk out on me halfway through the second to last chapter (because my reputation was 20 too, and I had no idea whether or not they'd actually go myself at that time, and so didn't really look at the alignment of those I had in my party).
Needless to say, having two or three characters leave suddenly leaves you in kind of a tight spot. I recall using potions of invisibility to sneak past my enemies on more than one occasion until I had another decent party ready (playing with anything less than a full 6-men-and-women crew was not an option for me back then).
So he'll leave, but it's probably better to either lower your reputation or kick him out before he quits, at an appropriate time.
EDIT: as for the aura cleansed, I know the message appears when you agree to steal a certain item in Baldur's Gate too, after you've given off the merchandise. As far as I know it just means the guards stop attacking you, although it appears at times when that wouldn't be the desired effect as well.
[ 11-22-2002, 08:49 AM: Message edited by: Legolas ]
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